How nice that you think that my posts are "fecund"! Like fertiliser, you mean? Full of...

Nietzsche the metaphor of artistic interpretation in a number of places, and I think he basically means that our values aren't prewritten for us, but rather there is a sense in which we take some fundamental drives and we 'create' with them. Sartre was influenced by this, I think, and he also compares moral choice to an act of artistic creation.
For instance, somewhere in "Exisentialism and Humanism" (which is very short and worth reading, if you haven't already), he uses an example which has since become famous: a man is faced with the choice of fighting in the war, or staying at home to look after his sick and aged mother. Sartre presents both choices as equally valid and 'authentic', and says that no moral theory can make that decision for us. The man, he says, is presented with a genuinely creative choice, one that will define the sort of person he is by his own values.
When we critique values in an artistic way, we are therefore concerned with higher ideals (what is beautiful, noble, brave, etc.), and there is always an element of subjective choice to this. Creative choices are not always wrong, but we often prefer certain artistic examples rather than others. All I was saying is that this is an element of moral decisions also.
There: I declare this can of worms now officially "Open"!